The CAS Registry Mumber 60681-19-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,6,8 and 1 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 60681-19: (7*6)+(6*0)+(5*6)+(4*8)+(3*1)+(2*1)+(1*9)=118 118 % 10 = 8 So 60681-19-8 is a valid CAS Registry Number.